Two parts look identical, same connectors, same mounting holes, almost the same part number, but are not interchangeable and have different functions.
But are they? Or I have one bad part?
I was cleaning my MAP sensors today on my EcoBoost, put them all back in, and got a very bad idle, and it's having trouble keeping itself alive, and it threw me a wrench P0236. I thought I damaged my sensors when cleaning. Upon closer inspection, I did a switcheroo, same part number except for the last two, which usually are revisions, etc, on most parts. Switch them back and everything is working fine.
DO I have one bad part?

 

Just part revisions. Same part.

I was wrong, see Steve's post down below.

 

Try unplugging each, one at a time, see what happens with the idle and measurements. If unplugging one fixes everything, that's probably a bad part.

 

Also…do you have a scan tool? I’d look at and compare readings.

 

I unplugged the one on the manifold, and it makes the idle rough and throws a wrench, so the sensor is working. It also makes the BOV go crazy, opening and closing. 140K miles and 10+ year old, maybe it's time to get new sensors.

I'm trying to troubleshoot my LT Fuel Trims and poor mileage. Other than that, the truck runs just fine.

 

Not the same part. Those are engineering numbers for two different sensors. The AA5A-9F479-AB is P/N AA5Z-9F479-D goes in the boost pipe and AA5A-9F479-DA is AA5Z-9F479-C which goes in the intake manifold.

 

Nope, two different part numbers.

 

https://parts.applefordwhitebearlake...sor-aa5z9f479d

https://parts.applefordwhitebearlake...sor-aa5z9f479c

 

After testing all 3 MAP sensors measure Vac and Pressure
The one on the intake manifold normal voltage is 2.0V.
The other one on the charged pipe is 1.5 volts.
The one by the Air Box is vaccume only type, starts at almost 5v

I used my bike pump to test it, and both go up to 4.8V.
Down to 0.89V is the maximum Vac I can achieve with my handyvac.

 

Thanks Steve. Learnt sumpin new today.